linux-ext4 - [Bug 71641] Unreasonable performance degradation in ext4 with full data journaling

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Message-ID: <bug-71641-13602-2fpbOVeeaY@https.bugzilla.kernel.org/>
Date:	Wed, 26 Mar 2014 10:30:36 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 71641] Unreasonable performance degradation in ext4 with full
 data journaling

https://bugzilla.kernel.org/show_bug.cgi?id=71641

--- Comment #7 from Chia-Hung Chang <fredchang.tc@...il.com> ---
(In reply to Theodore Tso from comment #6)
> Could you try changing JBD2_NR_BATCH (defined in include/linux/jbd2.h) from
> 64 to 256?  If that improves, you can try 512, but that might not make a
> further difference.

Thanks for your advice. The performance has the following improvement.

data=journal     JBD2_NR_BATCH=64          -> 398MB/s
data=journal     JBD2_NR_BATCH=256         -> 412MB/s
data=ordered               ->1.1GB/s

Do you have any other suggestions?

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